k8sでnatsdのStatefulSetを作成する

Makefile

.PHONY: all create-config-map

all:

create-config-map:
	# 設定ファイルConfigMapを作成
	kubectl create configmap nats-config --from-file=nats.conf

nats.

listen: 0.0.0.0:4222
http: 0.0.0.0:8222


# Cluster definition
cluster {
    listen: 0.0.0.0:6222

    # Routes are actively solicited and connected to from this server.
    # Other servers can connect to us if they supply the correct credentials
    # in their routes definitions from above.
    routes = [
        nats://nats:6222
    ]
}

# logging options
debug:   false
trace:   true
logtime: true

# Some system overides

# max_connections
max_connections: 100

# maximum protocol control line
max_control_line: 512

# maximum payload
max_payload: 65536

# Duration the server can block on a socket write to a client.  Exceeding the
# deadline will designate a client as a slow consumer.
write_deadline: "2s"

nats.service.yml

apiVersion: v1
# ヘッドレスサービスを作成
kind: Service
metadata:
  name: nats
  labels:
    name: nats
spec:
  selector:
    app: nats
  ports:
  - name: client
    port: 4222
  - name: cluster
    port: 6222
  - name: monitor
    port: 8222
  clusterIP: None

nats.stateful-set.yml

apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: nats
  labels:
    app: nats
spec:
  serviceName: nats
  replicas: 1
  template:
    metadata:
      labels:
        app: nats
    spec:
      # affinity:
      #   # Podの物理的配置ルールを指定
      #   podAntiAffinity:
      #     # nats 同士が別のnode　に配置されるのが優先されるように
      #     requiredDuringSchedulingIgnoredDuringExecution:
      #     - labelSelector:
      #         matchExpressions:
      #           - key: app
      #             operator: In
      #             values:
      #               - nats
      #       topologyKey: kubernetes.io/hostname
      containers:
      - name: nats
        image: nats:1.1.0-linux
        args: [ "--config", "/etc/nats/config/nats.conf"]
        volumeMounts:
          - name: config-volume
            mountPath: /etc/nats/config
        ports:
        - containerPort: 4222
          name: client
        - containerPort: 6222
          name: cluster
        - containerPort: 8222
          name: monitor
        livenessProbe:
          httpGet:
            path: /
            port: 8222
          initialDelaySeconds: 10
          timeoutSeconds: 5
      volumes:
      - name: config-volume
        configMap:
          name: nats-config